There's a pigeon in our puffy

And before your mind goes a wanderin', let me explain. We have a foot rest in the flat (or a puffy, pouffe or whatever you want to call it) and every time you move it you can hear a pigeon trapped inside. I can't seem to find any entrances or exits and I'm damned if I can dicover who's been feeding it to keep it alive. I guess some things you just aren't destined to find out.